Improvement in saw-frames



W. HANKIN'.

Improvemeflt in Saw- Frames.

YWITNESSE'S. Q I Q IN ENTOR No, 129,731, Pz ltented luiy 23, 1872.

the brace and cross-bar.

. UNIT D; STATES PATENT OFFIC WILLIAM HANKIN, OF HAWLEY, PENNSYLVANIA.

' IMPROVEMENT m SAW-FRAMES.

Specification forming part of Letters Patent No. 129,?31, dated July 23,1 872.

To all whom it may concern:

Be it known that I, WILLIAM HANKIN, of

' Hawley, in the county of Wayne and State of Pennsylvania, haveinvented a new and val- 1 uable Improvement in Saw-Frames; and I do,hereby declare that the following is a full,

clear, and exact description of the construction and operation of thesame, reference be ing had to the annexed drawing making a part of thisspecification, and to the letters and figures of reference markedthereon.

The figure of the drawing is a representation r of a side view of myinvention, partly sectional.

This invention has relation to the construction of buck-saw frames; andit consists in 3 providing such a frame with an oblique adjustablecross-bar and oblique brace runningfrom after set forth.

In the accompanying drawing, the letter A designates the saw-blade. Bindicates the long side bar or handle of the frame, mortiscd near itsupper end at a, and toward the sawblade at b, to receive, respectively,the ends'of B represents the short side bar, having, at about its middleportion, a curved shoulder, c, which is provided withma long mortise, d,to receive the tenoned front end of the cross-bar. The lower end of themortise c is about even with the lower end of the opposite mortise inthe handle; but its upper end extends some distance above the upper endof the said opposite mortise. O designates the cross-bar, having one ofits ends .inserted in the mortise in the handle and the other insertedin the long mortise of the short side bar. When pressure is applied tothe upper ends of the side bars the tendency of the front end of thecross-bar, which is provided with convex shoulders on each side of thetenon, is to ride up on the concave shoulder a of the short sidebars,thus throwing the cross-bar into an obliqueposition, with its frontend further from the blade than its rear end.

D represents the oblique brace, the rear end of which is seated in theuppermortise of the handle, and the forward end of which is stepped invaseat, 2, in the upper surface of the crossthe twisted cords, drawingtheupper ends of the side bars together, will, through the oblique brace D,tend to force the movable front tenon of the cross-bar downward towardthe sawblade, thus pressing outward the rear tenon of the cross-bar, andwith it the lower end of the handle, thus straining the blade. In myframe the cross-bar and brace are arranged to sustain the oblique strainof the work, which has a tendency to draw the lower end of the shortside bar toward the upper end of the handle. At the same time theoblique brace is arranged to run from the crossbar to that portion ofthelon g side bar which is grasped by the left hand, so that any extrapressure brought upon this portion of the frame, which, in the ordinaryconstructions, is least able to sustain able tenon further down in thelong slot and thus strengthen still further thebracing action.

Sometimes an auxiliary brace, n, is placed between the end of the braceD and the short side bar to keep this end of the brace 1) securely inplace.

What I claim as new is In a buck-saw frame, the combination, with theside bar B having the concave slotted Witnesses:

- WILLIAM H. HANKIN, Jr,

Z. E. SMITH.

bar, near its forward end. The torsion upon it, will only have atendency to force the movshoulder c, of the oblique cross-bar 0 having

